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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '40d8f21c538ebd71a530e1158f2420abde599514d9f5a5582215bc6ff2796c0d' 
  AND token = 'Q8gz93LfUlSPkWlLtMHeu3pQ7j65C0kx3I/M0nu6V00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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