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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a93ddbe45fc216ca54d64db177723947cabb8301f9d564863c586c2743ea195c' 
  AND token = '/eIi0N+7wE+4o2Ft7vWkqxggOrN0AoKtYROe4Rd1fzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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