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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c8b35bf9f74cb3e4d243bc23616dbf1154445eb1c1dbbea0ad2024fa2d029ca8' 
  AND token = 'Kkrm2ROswY9aPvI56K9HjJt2w3Uoc5ZoG/EklKLy35s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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