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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c0fe7f51ac9b3d5bb45ae2bf12d398e26ba0ca581d851906293ca9022ebec264' 
  AND token = '4S28/SbDnnvaTFZPPy1W3iAhjQvx0WMpN9tBc0sC2gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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