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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'aeb98d5f76d0a88d20e6ac7a10a5bafe27233405b915243728852e8c0ffc8026' 
  AND token = 'CnDD7qcW7Q2eWMjcpMNJaG9qc304fxSdyOn549nh8wQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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