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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '278f7ddfd2c4c140babeebdaef39e7a3506f63c6a56e3692b06ab3cf838abbde' 
  AND token = '+ba0t5X6s7PSMsg4eemt65ICND6lDyObhPxUYp2heDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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