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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f2211d46725c82ee6f8bfe6c8ab89e9fad3c48f8ba64a1e3d4340023f7a4c189' 
  AND token = 'oPOKezHfE8KvQ3Tpvs58Q8gCAnIKhlkfbbXULj8YkvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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