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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8f91318d7c7627bb53deb39299f274f3eecb772bbde952b4dcaab04b3aa0de98' 
  AND token = 'lN3J+vMsiqSpr/7P8gf2NF7d2O5ZozQqG4pC6TmaXNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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