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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9a9150ed1bdd57a1e72a33c1df0684d273a3ae328bb55b5070a6809c6557e8a1' 
  AND token = '30UumicqChnvt+KMQijR4l08iAapssqgHQWoa71alaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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