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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '196916f6908faeb9d4b1c6fabeb44fe8f2755989d8dfb08a28c86a30c44bd0d7' 
  AND token = 'g7sOrACI4G2j3+crp1D69gNRtQAG9O0txFDyqpOyPoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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