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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7d6e02d1c7d78fb7bec28cabab1520bf95a4de47f853691a33a085c6f13ea18a' 
  AND token = 'rJkioSBwnRCi296vMAcurfH0/Rp3o1smsM3te/AM2mU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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