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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '74b5f8e02ae48a46a21184a41eed6de4c8bd6267b98582188ea3243aae6fdace' 
  AND token = 't5REgORrDNifX6+HNtKAGHOzGb+1+VCWYu6GHIf7jvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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