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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '77a9fdbb82c8583e6966f414de0900a407036da756e21baf98e067ad2411b274' 
  AND token = 'W7HKtdKSnpEQzdzCBzUCk0i7Jkg0l4Q2qn6ReHLUlXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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