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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'eedea0aee7a0dab1ffa9911826652f45d76592300e15f4411431517952d76c3c' 
  AND token = 'T5+Wt3r8jka+6aySVgahiftInMwBQZZOItpUrVSvFUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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