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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '61eaadbf91c0c0c9e6bf249e1075704f07f2597a2e3559deadc766cf6f9e750f' 
  AND token = '/p0U65Gzs3fS8ssQ0LTmJAao/WHTtxIJL0pot0W3z7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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