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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c2586c6f8579bef1188f0dd99309de538ccddcc328f3342d79fc58c2459f7e61' 
  AND token = 'j22x9MJ0awSeEBq00DtquGbtoMGq1KxMTKiKn4kZrtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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