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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '975218651520c5d6c5e706e9f96d2f7a5947615e8c5cef238a3d4cbd878aa3f5' 
  AND token = 'yEXoNMGapYFtvMt1/24Ez2qsOG1wDlnC06G/eCl0ZeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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