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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3f409b0da2c64b03523e22e9826396b63683374b0771b21f4b55416d2d95e349' 
  AND token = 'VJjfi5S5cNHRCc6xd/rdVJ5cyUbMHrPKNnbldVXQb8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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