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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9f7fcda91721c2a5d706fc02f266e07ad93c9428b7223fbed4fd0052bf5acba7' 
  AND token = 'z1lDVz2bWGqXanHwCFO2plMGlQQ72DAobov8fKmEFm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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