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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7205c74664b49ef0b6860d581ce647915ae9209e8c54de8f104372a45694f61b' 
  AND token = 'vEBy1U6St6nS6FwuJzAP5xgaG1amfflu7J2xyW5ev7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00099

JSON explain

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