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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5c9e1456380fb4327512c35506771f19a3182e3f7fba27b5f25dde6055df091c' 
  AND token = 'O4sRgc29KRmEXAE1EjcF9yVKv4yl6yKf/eomFU11SA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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