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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3a186ba4af7c74eea5dadaa0725f763e30bc0c62bd841de44612fb685a30b965' 
  AND token = 'GvET6/f1gMee7qEcBe0UfElyUy0A6+ASxvYkCqzfQ5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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