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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f0dd8c2e8b3c72358d907268f4a7b750d5eb506b18e8d392a0fe68f9d782df3e' 
  AND token = 'Ws1b23elaAtRtLxp4VoPBszVDKpaGxc/byBujKISjEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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