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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bf75cfca07ffe7195035266ea2242a98ca8d6670f6db882941023429dc269634' 
  AND token = '03NmrU451vILEjHZquj4gct4H2NkMocR+FRc72bZDOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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