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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'eaf93e4eddaaa482136eded2b2f63587c3a347e18fd10dd50a202be20c87c068' 
  AND token = 'PavEF0g/fK0fG6MW5xGlcrw58wbEt0SZGfkvNcJ9nhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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