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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6a968a64d6c58f121cbb5fd9cb4962bd5f05dea4cb1f252fe13b1157385a4fe9' 
  AND token = 'FIik1Nx6on3WnINlw9lJPx5jCUC8wdn0W1u+b8FrrWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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