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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6d893084f5c5d1d94d39b94dd2704fb0d976ac60de06e22ad045c49d035cf959' 
  AND token = '3qE62IHosn8P56K+8cxHlQiLpwNwef8gz+H1104H4dA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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