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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9e944b409cd3765b3f5d79b7247fa3dc922b83f2e6b9bcd67de7f1bccee0290e' 
  AND token = 'q5uExDiFdU9KgQ/pc01A4V3J8bqXX8cysRht1KOE2vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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