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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cefed92ddcc223cdfe6c33277bbf96aa1a84e5aeb534b9132eddc61d07cf8e39' 
  AND token = 'kEXBukyac8hfLBvSp8AeV4S+vrM55kpPIe+rRdLXQ6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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