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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '29697699aa7d516ebc0bb38e8813dfe737a9e2ab57e33dc77cb53cc43caca25b' 
  AND token = 'JLMWyoD/JAmYpl2U5Xuvb2NPFUNnYS9ZDqr3SlrHczo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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