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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '96ebabf80f63ab7ebae3775597f9d8838c0bc526a587ef85e31e7af56353ac2c' 
  AND token = 'gV9P2OMRSXa2vuNZGRwql0Ybt4jDsZR2nD6vMbVxyns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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