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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6d6ee737fbaa08fa26b67ae03a3eb19b7f8d63cbb8bbaadd39a2bd187ea879b8' 
  AND token = 'Lk3xZNV4+Fy9JUjo5bbVyocEC1J79Wxprcxgs23ze1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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