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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'aea62146830b511d57375b574edbadf3dc2861afd736c04da10a526c8a02cef2' 
  AND token = 'lMYjiDdqQVW3ruP3rCsdTh9td7ixc1iNoAuzyJicInM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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