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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ea9cf9a84887c60731ea782a29d13c804d4f0a646ce83d1bb4f993a40f717671' 
  AND token = '89bvSyLBWaBr8iWALOeeGJGE86/+Z21YnkUIzX8D1r0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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