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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '46700367efc1cc44ff72893dc62a50c37302c39df76266ab22a436703c4f2c7e' 
  AND token = '6Aly9iCyh6+AO+w+tyLQx5hVKUnABPnB8U9l42asmTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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