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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1ba2c6b9f59784a92d386650a774cdb02379632aa5fc295ae8776586eee93a28' 
  AND token = 'ZCTM8z2R6SG0v0QxxSU26bJ4QZGrv8vda8jQaAOKSus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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