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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '792b06ea6bd5656db5d18343342e4bb170ee7a0ba97f2c9ed8f04e17b994536b' 
  AND token = 'd/bWEajy+0/XCY4s+fP1NDrQ3+lT8z+jiZFAKrNEPCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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