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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'eb291416ce2fbb29a4aa70ac49a57339062a3f145c1c8cc22d79426756d7b3c2' 
  AND token = 'I+xhN1+wxF+v7jEablJcK96+uV10T5F0Rsyn227bACY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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