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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '766f73fcea05f54a24db882466765bfdc02c973ae112bacffd039ce69a285e92' 
  AND token = 'qH0JFfGWxO3xDS2kH41WF+2WSFcG8EYQcQ3/Z/kdQg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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