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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f5130c01f966e793d1a62e3b1212a9a042e9c0e33aafc6a7731d601ec75e774b' 
  AND token = 'qfdjlLsZbP4DGTLsmDwgIfGNPNvTp+cA0V13Vc780VY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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