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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7393bc3e5e9323035ecc42c1dea3d7faaeb058c56ae4e9cf7b75f039ccf4f4e5' 
  AND token = '3ZBtlVrJ4mmvZqoWLgAnnni4Ts/2giMCtYuHf2Vckks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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