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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '046425d150eabc1f7d6179006ec7ffd595dd05be10c1b844f4d9f5e384609063' 
  AND token = 'kk+o6gsW0VURHUG+qrD078csJi09kLA1IjiL0aakHps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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