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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b5bdcca7cbc78c4d5192e4794c768b175ac28440470fb89a44cba71bccb45782' 
  AND token = 'PD8V/tmfgZH8tbgMl/ZHg12fHynz3oWOr3AOX6jnlyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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