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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2cb0c0599a68231031bf191aaf5b6e0a50d98cd1ea64ed3e851661da2f0d32c7' 
  AND token = 'mxbexqZ7elfPwcpkfifnerMo4KAYoA2Smb2p6fvDrQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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