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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1e08d40bb7572108f3a1013907d5e3bde831268cf2aafa4b7192eb3297c0f17e' 
  AND token = '+5cYdkr33JueswloIkz5H7y2Jyq81IUlJDuw3ny/VM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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