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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '910215e4e77f3a888bea1b6188370980b8a8c01f30affea8d3b731e275cd738b' 
  AND token = 'e3eS9XR6HEDX84bJdIieEYBUAqdCphjamPRrn8+XKOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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