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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd5392bd5c81882cf8b91a5071ea0fcc41c6f3032d56a7097dc45cc471e9cf973' 
  AND token = '8dHih8o+Rul2ci7JwF99fO+nwZFtp9KsRbylZciPcw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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