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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a849c350f732436337568198b334b9b0751208ac84130b3dcc2e008200002d49' 
  AND token = '9UPVeYDX1seavE/Dia0C3NRZqKMzC0v1pdjY/84CnPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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