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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '695ed656a2ff758617473ce9d2fd842bba599d8d853603616303867a1e0b1a79' 
  AND token = '/xQymWsGjrATx3g1uxkdaLEpzUv6d9Dc9Vn2eE2Ic80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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