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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '544432e558aac5dcc0af55ad982092d03fad7954fa94f92f1da2a445966e9e35' 
  AND token = 'qEoqlmNYwRpEC/zkT6CStv9AF/OXZ7Q2e/iSv2PIiVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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