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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2f44ca36a63c7ecd20520141c02875a2a52105e5f148d80b4c2c75ea0b30e1fc' 
  AND token = 'Uxr7/v6weMjcTxRZiuxu33yIF1SQF3smyy3v2geIRtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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