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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b19cf1b8df3c346eaae569c8d55bc07f75303278a94979578a3750eb40f931d9' 
  AND token = 'kXo0iVgYvn1WEGmbyWnwME590/FVj4frbm8tIf5KV1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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