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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'eb0711461a8390d916743f98ae31d08d3c39e70a2ee752cc1d716bceb006517a' 
  AND token = 'YgE3CMIWRP9plUB65tGEufBCiCn1nA9A2wtZ2GwbCsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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