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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8597d1f02fd2d95c19fd3d7e9044258974ff2e3dd4b37dd583188bfb1d70724d' 
  AND token = 'suhShFPwVYNdKsKUqnFtqRCaiuAo52imVMIvysFSmeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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