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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c1ac844bd4d9d1a3206cff9d34b07c52a7055f3448dcdaff6382f88e95613e3d' 
  AND token = 'Qqw8jbSP8eMKsseEs6S3XT/35agn/ikPHtaUhujrnSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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