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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cc8ee2e4f59d99202cb6ed87b79277afb5be77d4e2776d1ebae6f34fb1c287bd' 
  AND token = 'rZDgCBRNMhMmc/GHrnfs11j6sLn4NhbltNqyc9h5f6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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