Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2c78a0ef5e66d28887442f35e832c54ebeb2d7b44d4c4bb42f2e042cb857352' 
  AND token = 'KbULhwLucvqBVGLJqZFWYhOxcY7gNjuPT2shlrNrev0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}