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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2863c3b338722007588b22ef4bbc53c69ccabd8d70566e8dbc933397de946ccf' 
  AND token = 'R/gMg/4uUMmgV2pRRPRsCWbin8kX/vBOuLHPgIbCx0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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