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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'dd6f25a4fdc35dd04dbe0723df2a3fa4dad4a7369ac7922c230f7d4737a39f2d' 
  AND token = 'F2PZgcgjqQ64DxlNbOO1sAKlnndf43AQB6+3Xmhooak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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