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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '45c30a5d45a81bc910496488f7e2c24b1f5b1032a016858ceb49463a1acea22b' 
  AND token = '4NBzMAPBW/ShDh93z1r5yWZlLf/kmTVySs8OfVgH+c4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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