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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1d3f22f90c7bba3d2fa10c924cbaa2e1db0cc8eca0a6eaf3410bb3339c0d1848' 
  AND token = 'EhDMjm3XWx8FCsfo61sClL8hSI3mi6osRO3zlOv2MUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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