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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '766870334d052adcd64231b1a490dcad6e0e4af0473bf8eaefd6e52f77f668ad' 
  AND token = 'kWT4XvBlrBr3XzHCtyM33yvuS69EmI1Qb2pyddokS48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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